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A Variability resilient 128kbit 6T SRAM with energy consumption of 4.4pJ/access, operating at 80MHz for wireless sensor applications is developed in 90nm LP CMOS. The techniques developed include novelty in the local architecture with local read/write assist circuitry. VDD/2 pre-charged short local bit-lines with local sense amplifier enables charge re-cycling and gated read buffers eliminates bit-line...
We consider the problem of joint power control, scheduling and routing in energy harvesting sensor networks allowing for multicast of data generated at the sensor nodes to a set of sink nodes. In this setup we exploit broadcast nature of the channels and network coding to show performance improvement. We also develop computationally efficient suboptimal algorithms and study their performance.
We study a sensor node with an energy harvesting source. In any slot, the sensor node is in one of two modes: Wake or Sleep. The generated energy is stored in a buffer. The sensor node senses a random field and generates a packet when it is awake. These packets are stored in a queue and transmitted in the wake mode using the energy available in the energy buffer. We obtain energy management policies...
We address the problem of estimating a random field via a wireless sensor network. We use a Multiple Access Channel (MAC) as the basic building block for such a network. For Gaussian sources over Gaussian MACs, we show that Amplify and Forward scheme (AF) performs well in such sensor network scenarios where the battery power is at a premium. We then extend this result to the hierarchical network scenario...
A robust signal forwarding technique for wireless sensor and mesh networks using semidefinite constraints is proposed. The scheme considers a multiple source destination scenario where a set of relays assists forwarding signals from sources to destinations. In our work we consider a realistic environment where actual channel state information (CSI) available to the relays are in error. We propose...
We study sensor networks with energy harvesting nodes. The generated energy at a node can be stored in a buffer. A sensor node periodically senses a random field and generates a packet. These packets are stored in a queue and transmitted using the energy available at that time at the node. For such networks we develop efficient energy management policies. First, for a single node, we obtain policies...
In a typical sensor network scenario a goal is to monitor a spatio-temporal process through a number of inexpensive sensing nodes, the key parameter being the fidelity at which the process has to be estimated at distant locations. We study such a scenario in which multiple encoders transmit their correlated data at finite rates to a distant, common decoder over a discrete time multiple access channel...
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